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Years of efforts when they saw the pictures of the moon sent back to the earth by Chang’e-1.
A. paid off B. took off C. showed off D. went off
A.paid off B.took off C.showed off D.went off
Years of efforts ________ when they saw the pictures of the moon sent back to the earth by Changel.
A.showed off
B.took off
C.paid off
D.went off